50 common Linux commands.

1. ls - List files and directories

2. cd - Change directory

3. mkdir - Make directory

4. rmdir - Remove directory

5. cp - Copy files or directories

6. mv - Move files or directories

7. rm - Remove files or directories

8. touch - Create an empty file or update timestamp of an existing file

9. cat - Display contents of a file

10. more - Display contents of a file one page at a time

11. less - Display contents of a file one page at a time with additional features

12. head - Display first few lines of a file

13. tail - Display last few lines of a file

14. grep - Search for a pattern in a file

15. find - Search for files or directories with a specified name or pattern

16. chmod - Change permissions of a file or directory

17. chown - Change ownership of a file or directory

18. ps - Display information about running processes

19. top - Display system resource usage and processes

20. df - Display free disk space

21. du - Display disk usage of files and directories

22. tar - Create or extract tar archive files

23. zip - Create or extract zip archive files

24. unzip - Extract files from a zip archive file

25. ssh - Connect to a remote system over SSH protocol

26. scp - Copy files securely over SSH

27. rsync - Synchronize files and directories between local and remote systems

28. curl - Transfer data from or to a server

29. wget - Download files from the internet

30. ping - Test connectivity to a network device or server

31. traceroute - Display the route that network traffic takes to reach a destination

32. netstat - Display network connections and status

33. ifconfig - Display network interface configuration

34. route - Display or manipulate network routing tables

35. passwd - Change user password

36. useradd - Create a new user account

37. userdel - Remove a user account

38. groupadd - Create a new group

39. groupdel - Remove a group

40. hostname - Display or set the system hostname

41. date - Display or set the system date and time

42. cal - Display a calendar

43. who - Display users currently logged in

44. w - Display information about currently logged in users

45. uptime - Display system uptime

46. history - Display command history

47. sudo - Execute a command as superuser

48. apt-get - Install or update packages on Debian-based systems

49. yum - Install or update packages on Red Hat-based systems

50. lsblk - Display information about available block devices

These are just some examples of commonly used Linux commands, there are many more commands available that can be used for different purposes.